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Crack face closure effect and opening behaviors of fatigue pre-crack treated by laser peening
International Journal of Fatigue ( IF 6 ) Pub Date : 2023-05-30 , DOI: 10.1016/j.ijfatigue.2023.107740
Han Cheng, Yongxiang Hu

The present work investigates the generation process of crack face closure under laser shock and its effect on the crack opening behavior to reveal the underlying reason for the high-level crack closure induced by laser peening (LP) on the initial fatigue crack. It is found that crack face closure generates a firm compression to the crack face, causing the significant elongation in the crack wake during the crack opening process to prevent crack faces from separating even under the high-level external load. The contribution of crack face closure to crack retardation is comparable to LP-induced residual stress.



中文翻译:

激光喷丸处理疲劳预裂纹的裂纹面闭合效应及张开行为

目前的工作研究了激光冲击下裂纹面闭合的产生过程及其对裂纹张开行为的影响,以揭示激光喷丸 (LP) 在初始疲劳裂纹上引起高水平裂纹闭合的根本原因。发现裂纹面闭合对裂纹面产生牢固的压缩,导致裂纹尾流在裂纹张开过程中显着伸长,即使在高水平的外部载荷下也能防止裂纹面分离。裂纹面闭合对裂纹延迟的贡献与 LP 引起的残余应力相当。

更新日期:2023-05-30
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